struct _GstVideoCompositingMeta {
    GstMeta               meta;

    /* zorder : Depth Position of the layer in the final scene
     *        0 = background
     *    2**32 = foreground
     */
    guint                 zorder;
    /* x,y    : Spatial position of the layer in the final scene
     */
    guint                 x;
    guint                 y;
    /* width/height : Target width/height of the layer in the
     *   final scene.
    */
    guint                 width;
    guint                 height;
    /* basewidth/baseheight : Reference scene width/height
     *   If both values are zero, the x/y/width/height values above
     *   are to be used as absolute coordinates, regardless of the
     *   final scene's width and height.
     *   If the values are non-zero, the x/y/width/height values
     *   above should be scaled based on those values.
     *     Ex : real x position = x / basewidth * scene_width
    guint                 basewidth;
    guint                 baseheight;
  }